— io37 — 
form tlie cell is somewhat si milar to G. eductum Roy and Biss. It inight also be com- 
pared with C. bigemma Racib. 
208. Cosmarium dichondrum W. and G. S. West. — Antioquia : n° 4 - 
209. Cosmarium distichoides sp. nov. 
C. parvum, paullo longius quam latum, profundissime constrictum, sinu anguslo- 
lineari extremo leviter ampliato; semicellulæ semicirculari-trapeziformes, lateribus convexis 
4 - 5 -unduIato-gTanulalis et cum granulis sparsis 2 vel 3 intra sed juxla marginem, angulis 
basalibus leviter rotundatis, angulis apicalibus vix rotundalis, apice recto, intra ambitu 
semicellulæ sérié granulorum majorum 8 , in centro supra isthmum granulis binis trans- 
verse ordinatis instructæ ; a vertice visæ ellipticæ, polis granulatis, granulis binis majoribus 
ad medium utrobique ; membrana punclata. 
Long. 35-37 P- ! 3 o -33 p. ; lat. isthm 10 g. ; crass. 18-19 ; (PL XXIII, fig. 65 - 66 ). 
Antioquia: Bog near the Laguna above Medellin, Central Andes; allit. 23 oo m. 
N° 5 . Cundinamarca : Laguna du Paramo Cruz Verde above Bogota, Eastern Andes ; 
altit. 2700 m. N° 24. 
This species seems vvell characterized by t lie nature and disposition of ils granules. 
It should be coinpared with C. distichum Nordst, G. distichum var. ivregulare Eicul. 
and Racib., C. septenarium Eichl. and Racib., C. Jundzdlii Racib. var. podlachicum 
Eicul. and Racib. and C. areguense Borge, from ail of wliicli it is easily distinguished. 
210. Cosmarium docidioides Lütkem. (= Penium minutum (Ralfs) Cleve ; Doci- 
dium minutum Ralfs). — Antioquia : n 0s 1, 2 and 5 . 
21 1. Cosmarium floriferum Sp nov. 
C. parvum, tam longum quam latum, profunde constrictum, sinu angusto-lineari 
extremo leviter ampliato ; semicellulæ transverse oblongo-semicirculares, angulis basali- 
bus late rotundatis, parle superiori infra apicem marginis lateralis uniuscu jusque leviter 
retusa, angulis superioribus leviter rotundatis, apice recto ; membrana verrucosa, verru- 
cis multe depressis cum marginibus minute granulatis, verrucis granulatis 4 ad marginem 
lateralem unumquemque, 4 ad apicem, 9 intra marginem semicellulæ, et sérié singula 
verrucarum 5 vel 6 trans semicellulam ; a latere visæ depresso-circulares ; a vertice visæ 
ellipticæ, polis late rotundatis, lateribus cum tumore lato utrobique. 
Long. 26-28 [y.; lat. 26-28 p. ; lat. apic. 12-14 p- ; lat. isth. 9-9,5 p. ; crass. 16-17 p.. 
(PL XXIII, fig. 70-71). 
Antioquia : Laguna above Medellin, Central Andes ; allit. 23 oo m. N" s 1 and 2. 
This pretty li l lie Cosmarium should be compared with C. ornatum Ralfs forma 
Bôrgesen (in Vidensk. Medd. nalurh. Foren. Kjôbenhavn, 1890, p. 944, L 4 , f- 29) and 
C. ornatum forma Borge (in Rili. till K. Sv. Yet-Akad. Handl. Bd. 24, Afd. III , n° 12, 
1899, p. 23 , t. I, f. 26). Although in the oui li ne of lhe cell C. floriferum closely resem- 
bles C. ornatum , it is considerably smaller tlian any form of the la lier species and lhe 
granulation is of a total ly different character. The granules are themselves much more 
minute and are arranged in groups of from 4 to 6 at the margins of gréa t ly llaltcned 
